The Snap On Tools 6 pc FA Hex Allen Bit Socket Set includes sizes from 4mm to 8mm, as well as 3/16th inch. These sockets are designed for use with hex/allen drive types and are made in the United States by the reputable brand Snap On. The set includes multiple sizes to suit a variety of automotive needs, making it a valuable addition to any tool collection. 4,4.5,5,6,7,8